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Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er~(3+)/Yb~(3+) co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic of output power sag with pulse duration and repetition rate was shown. Whether single or multi-channel input pulses are amplified, the shorter the input pulse duration is, the smaller the power sags of output pulse will be. At low repetition rate, upper gain values(G_ upper ) of gain swing are almost the same for different input pulse durations, which tend to the small signal gain, but lower gain value(G_ lower ) of short input pulse is larger than that of long input pulse. At high repetition rate, lower gain value(G_ lower ) approaches to upper gain value(G_ upper ).
Based on propagation-rate equations, the influence of different input pulse durations on the properties of Er ~ (3 +) / Yb ~ (3+) co-doped double-clad fiber amplifier at dynamic equilibrium was analyzed. The change characteristic of output Whether single or multi-channel input pulses are amplified, the shorter the input pulse duration is, the smaller the power sags of output pulse will be. At low repetition rate, upper gain values ( G_upper) for gain swing are almost the same for different input pulse durations, which tend to the small signal gain, but lower gain value (G_low) for short input pulse is larger than that of long input pulse. At high repetition rate, lower gain value (G_low) approaches to upper gain value (G_upper).